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A159345
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a(n) is the number of digits in the decimal expansion of Pi needed to contain a repeated n-digit substring.
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3
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3, 22, 63, 135, 555, 1301, 4607, 15441, 33852, 240488, 694409, 857993, 5563724, 9289707, 28048931, 129440103, 262527982, 1982424660, 8858170624
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OFFSET
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1,1
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LINKS
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EXAMPLE
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We need 3 digits (141) to find the first digit to repeat (the repeated digit is 1).
We need 22 digits (1415926535897932384626) to find the first 2 digit repeat (the repeated 2-digit substring is 26).
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CROSSREFS
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KEYWORD
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base,nonn,hard
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AUTHOR
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STATUS
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approved
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